RDBE: 2 nd Generation VLBI Digital Backend System. Alan Whitney MIT Haystack Observatory
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1 RDBE: 2 nd Generation VLBI Digital Backend System Alan Whitney MIT Haystack Observatory
2 1 st generation DBE development at Haystack DBE1 (developed ) Hardware is based on a flexible FPGA-based signal-processing board from UC Berkeley ( ibob ) Developed collaboratively between Haystack and UC Berkeley Space Sciences Laboratory DBE design based on Polyphase Filter Bank (PFB) concept Processes each of 2x512MHz IFs to 16 32MHz subbands on two VSI-H output connectors; total 4096Mbps to 2xMark 5B+ Sample-clock synthesizer with temp coef <1ps/degC In regular use for past ~3 years for mm-vlbi experiments and VLBI2010 development; often used with two systems in parallel (i.e. 2 DBE1s driving 4 Mark5 B+ s) for sustained 8Gbps recording rate
3 2 nd generation: RDBE Based on ROACH board developed by Berkeley, NRAO and South Africa Up to 10 GigE data output(s) to Mark 5C/Mark 6 Collaborative firmware/software development by Haystack, NRAO, Berkeley and South Africa Haystack developing system-level FPGA framework, PFB signalprocessing module, and software framework NRAO creating tunable DDC version to replace analog BBCs; part of VLBA upgrade to 4Gbps PowerPC OS developed by South Africa
4 ROACH block diagram Roach V1
5 RDBE characteristics Common FPGA, OS and software framework VSI-S compatible control/monitor Continuous state-count monitoring Tsys measurements using synchronously-controlled noise diode Multiple-channel real-time phase-calibration extraction RDBE/DDC personality is software changeable (few seconds) Two hardware variants (both with ROACH board) RDBE-H Single ADC board (i.e. 2 IF inputs) IF auto-level control (ALC) using external digitally controlled attenuator NRAO-designed synthesizer board (4 sampler clock outputs, four 1pps outputs RDBE-S Dual ADC boards (i.e. 4 IF inputs) Haystack-designed synthesizer board (1 sample clock output, single 1pps output)
6 Three Initial Designs with Common Software Architecture RDBE-H hardware platform Target: VLBI2010 geodesy IF Inputs: 2x512 MHz Output: 16 arbitrarily selectable 32MHz PFB channels (2 Gbps total on single 10GigE output); VDIF data format Other: ALC board for control of IF input power; Tsys; phase-cal extraction Status: Tsys & pcal extraction still under development/test Plans: Extend to 4x512 MHz IF inputs (4 Gbps output rate) Target: VLBA IF Inputs: 2x512 MHz Output: 8 sub-bands, each selectable from either IF input, and each with selectable BW from 62.5 khz to 128 MHz; frequency step-size TBD (multiple of kHz?) Same as above, except flexible Digital-DownConverter (DDC) module replaces PFB module Status: Under test at NRAO RDBE-S hardware platform Target: Wideband astronomy IF Inputs: 4 x 512 MHz Outputs: 4 x 512 MHz bands 2 b/s; 8Gbps total on four 10GigE outputs; VDIF data format Status: Occasional duplicate samples (under investigation)
7 RDBE housed in 3U ROACH Hotel
8 Summary 3 RDBE versions under development; all expected to be operational with next few months Hardware can be purchased from Digi- Comm Electronics, Richmond, CA
9 Questions?
10 DBE System DBE: 2x (iadc + ibob); 8Gbps output (4xVSI-H) DBE Total system cost ~$65K Mark5B+: 2Gb/s VSI-H each (DBE supports 4 Mk5B+s) Current modes: 15 channels, each 32MHz, 2-bit = 1920Mb/s 15 channels, each 16MHz, 2-bit = 960Mb/s
11 DBE1 vs DBE1 with no phase adjustments whatever RMS phase across frequency channels: RMS: 2.5 deg Theor: 1.0 deg Comparable to best we ve seen even with manual adjustments to embedded phase-cal
12 1024MHz RDBE diagram (PFB mode) V5SX95T FPGA Julian Clk 512MHz IF0 IF1 ADC 8-bit 2 chan 256MHz Clk FIR FIR BiPlex FFT Interp Filter 32 Ch 2-bit Quantization Mk5B Format Header Gen GPS 1 PPS To ALC Input Power Level Phase Cal Switched Tsys Digital Gains State Counts 10Gb Ethernet 4Gb/s Each 512 MHz IF split into 16 channels, each 32 MHz. Mk5C
13 RDBE diagram (DDC mode) 1024MHz V5SX95T FPGA Julian Clk 512MHz IF0 IF1 ADC 8-bit 2 chan 256MHz Clk NRAO DDC 32 Ch n-bit Quantization Mk5B Format Header Gen To AGC GPS 1 PPS Input Power Level Phase Cal Switched Tsys Digital Gains State Counts 10Gb Ethernet 4Gb/s DDC s: 62.5kHz MHz, tunable over full IF range. Goal to replicate current VLBA BBC capability. Mk5C
14 RDBE Software Architecture Commands in VSI-S format.
15 Sweep Through PFB Channels 10GbE data output processed in MATLAB
16 Noise and Tone Testing 10GbE data output processed in MATLAB. Testing by Spencer Cappallo
17 RDBE VLBI Demonstration Stations Westford 18m MV3 5m at GGAO Source 4C minute scan Cooled broadband dual linear polarization feed and LNAs covering 2-12 GHz 512 MHz band selected around 8.5 GHz RDBE at both sites Eight 32-MHz channels from each of two polarizations merged onto single 10GigE line at 2 Gbps Data recorded on Mark5C in Mark5B data format
18 VLBI Results from RDBE test Autocorrelation Spectrum Amp & Phase vs time on Westford-to-MV3 baseline (SNR~20)
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